When my son shut it down it started an update.
It has said "now installing 5 of 21" for about 3 hours now. I kinda figure it isn't going anywhere.
What to do?
It didn't come with a system disk, so reformatting isn't a option.
On a search I found a recommendation to put F8 during the bootup and tell it to use the last good configuration, but when I tried that on another XP box it ignored the F8, so I don't think that will be useful.